Knocker



FIG. 1 is a front perspective view of a knocker showing the new design;

FIG. 2 is a top view of the knocker of FIG. 1;

FIG. 3 is a front view of the knocker of FIG. 1;

FIG. 4 is a rear view of the knocker of FIG. 1;

FIG. 5 is a bottom view of the knocker of FIG. 1;

FIG. 6 is a left side view of the knocker of FIG. 1; and,

FIG. 7 is a right side view of the knocker of FIG. 1.

The broken lines shown in the drawings are for the purpose of illustrating unclaimed portions of the knocker and form no part of the claimed design. 

I claim the ornamental design for a knocker, as shown and described. 